Stop motion for sewing machines



c. J. FRANKLIN. M STOP MOTION FOR SEWING MACHINES.

APPLICATION FILED DEC. 29. I920.

- Patented Sept. 26, 1922;

3 SHEETS-SHEET I- 0:1. FRANKLIN. STOFMOTION FOR SEWING MACHINZS,

APPLICATION FILED" Dib. 29. I920.

Patented Sept. 26 19:22.

3 SHEETS-SHEET 2- 0. J. FRANKLIN. STOP mofmu. ron szwme MACHINES- APPLICATION FILED DEC.29I I920. A I 1,430,498; y l ed p 26, 19.22.

3 SHEETS-SHEET 3- CHARLES J. FRANKLIN, OF CAMDEN, NEW] JERSEY, ASSIGITOB, TO CAMDEN CURTAIN 8g EIi'IIBROIDEBJY COMFANY, OI! CAMDEN, NEN JERSEY, A" GORPORATION- OE NEW JERSEY.

STOP MOTION FOR SEVJING MACHINES;

To all whomit may concem:

Be it known, that L'CnAnLns J. FRANKLIN, a citizen or the United States, residing in Camden, Camden CountynNew Jersey, have invented certain Improvements in Stop Motions for Sewing Machines, of which the following is a specification.

My invention relates to certain improvements in sewingmachines which are used in factories for hemstitching and for other purposes and which are driven at a high speed, and the object of my invention is to provide a simple and effective stop motion for machines of this type which will be actuated to stop the mechanism of the particular machine when the thread breaks.

This object I attain in the following manner, reference being had to the accompanying drawings, in which i I Fig. 1 is a side view of sufficient of a sewing machine to illustrate my invention;

Fig. 2 is an end view showing the thread retaining the parts out of action;

Fig. 3 is a diagrammatic sectional view showing the parts in action when the thread has been broken; and

Fig. 4 is a detached perspective view of the stop mechanism.

1 is the base of the sewing machine having a standard 2 and arm 3 of the usual. type. 4 is the head carrying the presser bar 5 and the needle bar 6. 7 is the belt wheel. at the opposite end of the machine from the head 4, and 8 is the hand wheel. 9 is the usual type of clutch by which the belt wheel can be connected with or detached from the operating shaft of the machine. Mounted on a stud 10 is a hub 11 having two arms, the arm 12 being the clutch arm, the end 13 ofwhich is tapered so that when the clutch arm is moved it will actuate the clutch 9 throwing it into engagement with the belt wheel. 14 is the brake lever which has a projection 15 arranged to come in contact with the hand wheel 8, as shown in Fig. 2. This mechanism is common in certain types of sewing machines. At or about the center of the arm 3 is an enlargement 16, and pivoted to a shaft 17 is a slotted arm 18 actuated by a cam with in the arm 3 of the machine. This slotted arm 18 is connected by a rod 19 with the means for imparting a movement to the needle carrier to produce a hemstitch. ll make no claim to this particular {feature of tached to bearings 28 and'29. The thread then extends from the eye 24 to a guide, 30

and from this guide to the needle 31:. on the inner end of the rock shaft27, is a crank which extends intoa slot 33 in a lever 34 pivoted at 35 to a bracket 36. The lever is connected to a link 37 at 38, and this link is connected at 39 to an arm 40 which is pivoted in turn to an arm 41' secured to a longitudinal shaft 42. The arm. 40 has a shoulder 43, and a projecting portion 44 which acts as, a stop so that when the lever moves towards the finger 45 on a shaft 1 7, this finger will posh tively move'the arm 40and turn the shaft 42. The shaft l? on which the, finger 45 is mounted is the shaft on which the slotted arm 18 is mountedand is, connected to the means for imparting a vibratory movement to the needle in making a hems'titch. The shaft 42 18 supported in bearings 46 mounted on the base 1 of the machine, and on the inner end of this shaft 42 is an arm 47 having a pin 48 which extends under a trip arm 49 pivoted at 50and which is notched at 51 to engagea portion 52 of an arm 53, which is an integral part of a shaft 54, extending pa allel with the shaft 42. .Thisshaft 54 is also mounted in the bearings 46 and has at its outer end a projecting arm 55 bywhich the mechanism 'canbe set after. the machine has been re-threaded. The shaft42 is bent at its forward end 56 to engage the head of the machine so as to limit its movement in one direction. Other means may be provided for limiting this movement, if found desirable, and the shaft in this instance may terminate at the first bearing 46. The brake arm 14 is shaped as shown in Fig. 2 and has a pin 57 which is engaged by the arm 53 so as to hold the brake clear of the hand wheel 8. Attached to this pin 57 and to a pin 58,

on the frame of the machine is a spring 59 which tends to movethe brake arm 14 in contact with the hand wheel, but which is prevented from movingthe brake by the arm 53/From the moment this arm is released from the trip arm 49 the spring forces the arm. 3 out of positio mu ing he shaft 54.

of the arm 53.

to rock, at the same time moving the brake arm lt in contact with the hand wheel, and as the clutch arm 12 is on the same hub as the brake arm, the clutch arm is moved to release the clutch and stop the machine. The trip arm 49 has a weight 60, and this weight may be of any size, so that the arm will drop into position on the projection 52 It will be noticed that the thread normally holds the lever 55% and arm 4:0 and its connections in the position illustrated in lFig. 2, but the moment the thread breaks the weight of the parts causes the arm 40 to move into the path of the vibrating finger L5. This stop motion is very delicate but is positive in its action, as the moment a thread breaks the power mechanism operates the parts to apply the brakes and release the clutch.

I claim:

1. The combination in a stop mot-ion for a sewing machine of a clutch; a hub having a clutch arm and a brake arm needle mechanism; tension mechanism; a rock shaft; an arm thereon having an eye through which the thread passes to the needle from the tension mechanism; a shaft for actuating the needle mechanism; a finger on the last named shaft; an arm and means connecting the arm with the rock shaft so that when the thread breaks the arm will be in position to be actuated by said finger, and means for applying the brake and releasing the clutch actuated by the longitudinal movement of the said arm.

2. The combination in a sewing machine of a power shaft; abelt wheel; clutch mechanism for connecting the belt wheel to the power shaft; a hub having two arms, one

varm actuating the clutch and the other arm acting as a brake; a transverse shaft and means for vibrating the needle from said shaft, said shaft having a finger; tension mechanism for the thread; a rock shaft; an arm on the rock shaft havin an eye through which the thread passes from the tension mechanism to the needle; a crank on the said rock shaft; a lever pivoted to the frame of the machine and arranged to be actuated by the said crank; an having a shoulder and a link connecting the said arm with the lever; a shaft having an arm to which the first mentioned arm is connected, and having a pin; a trip arm pivoted to the frame of the machine and extending over the pin; a shaft extending parallel with the last men tioned shaftand havino' an arm engaged by the trip arm and which engages the brake arm, holding it out of action, and a spring held n tension by the said arm so that the moment the thread breaks the shouldered a in will he moved into the path of the linger on the transverse shaft, which. will cause the trip arm to be lifted applying the brake and throwing out the clutch.

3. The combination in a stop motion for a sewing machine of a power shaft; a clutch; means for operating the clutch and applying the brake; an arm having an eye through which the thread passes to the needle of the machine; roclr shaft on which said arm is mounted; a crank on the rock shaft; a lever pivoted to the frame of the machine and engaged by the crank; a transverse link connected to the opposite end of the lever; an arm to which the link is connected, said arn having shoulder; a second shaft having an arm to which the shouldered arm is pivoted, this latter arm having a pin; a pivoted trip arm under which the pin extends bearings for the second saaft; a third shaft having an arm extending under the trip arm and retained in a notch in the trip arm; means for vibrating the needle; a power shaft for operating the vih "ating mechanism said power shart having a linger so located in respect to the shouldered arm that when the thread breaks the shouldered arm will move to a position in the path of the finger which is reciprocated, so that the linger will move the arm longitudinally and lift the trip arm and release the brake mechanism and Glutch.

CHARLES J. lTlRAllKLlN. 

